<!doctype html>
<html>

  <head>
    <meta charset="utf-8">
    <title></title>
    <style>
      html {
        height: 100%;
        background: #000d4d;
        background-image: -webkit-radial-gradient(ellipse farthest-corner at center top, #000d4d 0%, #000105 100%);
        background-image: radial-gradient(ellipse farthest-corner at center top, #000d4d 0%, #000105 100%);
        cursor: move;
      }

      body {
        width: 100%;
        margin: 0;
        overflow: hidden;
        min-height: 600px;
      }

    </style>
  </head>

  <body>


    <canvas id="canv"></canvas>
    <script>
      var wWid = window.innerWidth;
      var wHe = window.innerHeight;
      if (wWid < 1200) {
        wWid = 1200
      }
      if (wHe < 600) {
        wHe = 600
      }
      var num = 200;
      var w = wWid;
      var h = wHe;
      var max = 100;
      var _x = 0;
      var _y = 0;
      var _z = 150;
      var dtr = function (d) {
        return d * Math.PI / 180;
      };

      var rnd = function () {
        return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180);
      };
      var dist = function (p1, p2, p3) {
        return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2));
      };

      var cam = {
        obj: {
          x: _x,
          y: _y,
          z: _z
        },
        dest: {
          x: 0,
          y: 0,
          z: 1
        },
        dist: {
          x: 0,
          y: 0,
          z: 200
        },
        ang: {
          cplane: 0,
          splane: 0,
          ctheta: 0,
          stheta: 0
        },
        zoom: 1,
        disp: {
          x: w / 2,
          y: h / 2,
          z: 0
        },
        upd: function () {
          cam.dist.x = cam.dest.x - cam.obj.x;
          cam.dist.y = cam.dest.y - cam.obj.y;
          cam.dist.z = cam.dest.z - cam.obj.z;
          cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
          cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
          cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam
            .dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
          cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z *
            cam.dist.z);
        }
      };

      var trans = {
        parts: {
          sz: function (p, sz) {
            return {
              x: p.x * sz.x,
              y: p.y * sz.y,
              z: p.z * sz.z
            };
          },
          rot: {
            x: function (p, rot) {
              return {
                x: p.x,
                y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
                z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
              };
            },
            y: function (p, rot) {
              return {
                x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
                y: p.y,
                z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
              };
            },
            z: function (p, rot) {
              return {
                x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
                y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
                z: p.z
              };
            }
          },
          pos: function (p, pos) {
            return {
              x: p.x + pos.x,
              y: p.y + pos.y,
              z: p.z + pos.z
            };
          }
        },
        pov: {
          plane: function (p) {
            return {
              x: p.x * cam.ang.cplane + p.z * cam.ang.splane,
              y: p.y,
              z: p.x * -cam.ang.splane + p.z * cam.ang.cplane
            };
          },
          theta: function (p) {
            return {
              x: p.x,
              y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta,
              z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta
            };
          },
          set: function (p) {
            return {
              x: p.x - cam.obj.x,
              y: p.y - cam.obj.y,
              z: p.z - cam.obj.z
            };
          }
        },
        persp: function (p) {
          return {
            x: p.x * cam.dist.z / p.z * cam.zoom,
            y: p.y * cam.dist.z / p.z * cam.zoom,
            z: p.z * cam.zoom,
            p: cam.dist.z / p.z
          };
        },
        disp: function (p, disp) {
          return {
            x: p.x + disp.x,
            y: -p.y + disp.y,
            z: p.z + disp.z,
            p: p.p
          };
        },
        steps: function (_obj_, sz, rot, pos, disp) {
          var _args = trans.parts.sz(_obj_, sz);
          _args = trans.parts.rot.x(_args, rot);
          _args = trans.parts.rot.y(_args, rot);
          _args = trans.parts.rot.z(_args, rot);
          _args = trans.parts.pos(_args, pos);
          _args = trans.pov.plane(_args);
          _args = trans.pov.theta(_args);
          _args = trans.pov.set(_args);
          _args = trans.persp(_args);
          _args = trans.disp(_args, disp);
          return _args;
        }
      };

      (function () {
        "use strict";
        var threeD = function (param) {
          this.transIn = {};
          this.transOut = {};
          this.transIn.vtx = (param.vtx);
          this.transIn.sz = (param.sz);
          this.transIn.rot = (param.rot);
          this.transIn.pos = (param.pos);
        };

        threeD.prototype.vupd = function () {
          this.transOut = trans.steps(

            this.transIn.vtx,
            this.transIn.sz,
            this.transIn.rot,
            this.transIn.pos,
            cam.disp
          );
        };

        var Build = function () {
          this.vel = 0.04;
          this.lim = 360;
          this.diff = 200;
          this.initPos = 100;
          this.toX = _x;
          this.toY = _y;
          this.go();
        };

        Build.prototype.go = function () {
          this.canvas = document.getElementById("canv");
          this.canvas.width = wWid;
          this.canvas.height = wHe;
          this.$ = canv.getContext("2d");
          this.$.globalCompositeOperation = 'source-over';
          this.varr = [];
          this.dist = [];
          this.calc = [];

          for (var i = 0, len = num; i < len; i++) {
            this.add();
          }

          this.rotObj = {
            x: 0,
            y: 0,
            z: 0
          };
          this.objSz = {
            x: w / 5,
            y: h / 5,
            z: w / 5
          };
        };

        Build.prototype.add = function () {
          this.varr.push(new threeD({
            vtx: {
              x: rnd(),
              y: rnd(),
              z: rnd()
            },
            sz: {
              x: 0,
              y: 0,
              z: 0
            },
            rot: {
              x: 20,
              y: -20,
              z: 0
            },
            pos: {
              x: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
              y: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
              z: this.diff * Math.sin(360 * Math.random() * Math.PI / 180)
            }
          }));
          this.calc.push({
            x: 360 * Math.random(),
            y: 360 * Math.random(),
            z: 360 * Math.random()
          });
        };

        Build.prototype.upd = function () {
          cam.obj.x += (this.toX - cam.obj.x) * 0.05;
          cam.obj.y += (this.toY - cam.obj.y) * 0.05;
        };

        Build.prototype.draw = function () {
          this.$.clearRect(0, 0, this.canvas.width, this.canvas.height);
          cam.upd();
          this.rotObj.x += 0.1;
          this.rotObj.y += 0.1;
          this.rotObj.z += 0.1;

          for (var i = 0; i < this.varr.length; i++) {
            for (var val in this.calc[i]) {
              if (this.calc[i].hasOwnProperty(val)) {
                this.calc[i][val] += this.vel;
                if (this.calc[i][val] > this.lim) this.calc[i][val] = 0;
              }
            }

            this.varr[i].transIn.pos = {
              x: this.diff * Math.cos(this.calc[i].x * Math.PI / 180),
              y: this.diff * Math.sin(this.calc[i].y * Math.PI / 180),
              z: this.diff * Math.sin(this.calc[i].z * Math.PI / 180)
            };
            this.varr[i].transIn.rot = this.rotObj;
            this.varr[i].transIn.sz = this.objSz;
            this.varr[i].vupd();
            if (this.varr[i].transOut.p < 0) continue;
            var g = this.$.createRadialGradient(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i]
              .transOut.p, this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2);
            this.$.globalCompositeOperation = 'lighter';
            g.addColorStop(0, 'hsla(255, 255%, 255%, 1)');
            g.addColorStop(.5, 'hsla(' + (i + 2) + ',85%, 40%,1)');
            g.addColorStop(1, 'hsla(' + (i) + ',85%, 40%,.5)');
            this.$.fillStyle = g;
            this.$.beginPath();
            this.$.arc(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2, 0, Math.PI *
              2, false);
            this.$.fill();
            this.$.closePath();
          }
        };
        Build.prototype.anim = function () {
          window.requestAnimationFrame = (function () {
            return window.requestAnimationFrame ||
              function (callback, element) {
                window.setTimeout(callback, 1000 / 60);
              };
          })();
          var anim = function () {
            this.upd();
            this.draw();
            window.requestAnimationFrame(anim);
          }.bind(this);
          window.requestAnimationFrame(anim);
        };

        Build.prototype.run = function () {
          this.anim();

          window.addEventListener('mousemove', function (e) {
            this.toX = (e.clientX - this.canvas.width / 2) * -0.8;
            this.toY = (e.clientY - this.canvas.height / 2) * 0.8;
          }.bind(this));
          window.addEventListener('touchmove', function (e) {
            e.preventDefault();
            this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8;
            this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8;
          }.bind(this));
          window.addEventListener('mousedown', function (e) {
            for (var i = 0; i < 100; i++) {
              this.add();
            }
          }.bind(this));
          window.addEventListener('touchstart', function (e) {
            e.preventDefault();
            for (var i = 0; i < 100; i++) {
              this.add();
            }
          }.bind(this));
        };
        var app = new Build();
        app.run();
      })();
      window.addEventListener('resize', function () {
        canvas.width = w = wWid;
        canvas.height = h = wHe;
      }, true);

    </script>
  </body>

</html>
